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PHP | Gmagick getimagesignature() Function

Last Updated : 28 Aug, 2019
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The Gmagick::getimagesignature() function is an inbuilt function in PHP which is used to generate an SHA-256 message digest for an image.

Syntax:

string Gmagick::getimagesignature( void )

Parameters: This function does not accept any parameter.

Return Value: This function returns a string of SHA-256 hash of the file.

Below programs illustrate the Gmagick::getimagesignature() function in PHP:

Original Image 1:
https://media.geeksforgeeks.org/wp-content/uploads/geeks-21.png

Program 1:




<?php
  
// PHP program to illustrate getimagesignature() function
$image = new Gmagick(
  
// Using getimagesignature() function
$pixels = $image->getimagesignature();
  
print($pixels);
?>


Output:

f64054f5bcb4cfb82c6126eff6d3d4e6be7d0e72d5620033442cecb4b9feabbd

Original Image 2:
https://media.geeksforgeeks.org/wp-content/uploads/Screenshot-from-2018-10-16-23-23-54.png

Program 2:




<?php 
  
$string = "Computer Science portal for Geeks!"
  
// Creating new image of above String 
// and add color
$im = new Gmagick(); 
$draw = new GmagickDraw(); 
  
// Fill the color in image 
$draw->setFillColor(new GmagickPixel('green')); 
  
// Set the text font size 
$draw->setFontSize(50); 
  
$metrix = $im->queryFontMetrics($draw, $string); 
$draw->annotation(0, 40, $string); 
$im->newImage($metrix['textWidth'], $metrix['textHeight'], 
        new GmagickPixel('white')); 
  
// Draw the image         
$im->drawImage($draw); 
$im->setImageFormat('jpeg'); 
  
// Using getimagesignature function
$pixels = $im->getimagesignature();
  
print($pixels);
?>


Output:

ed79035e13153385c344d19586e98941dd336165a3ca486200097c0bd2f4188c

Reference: http://php.net/manual/en/gmagick.getimagesignature.php



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